/** 学生智能排座系统 - 样式表 */
:root {
    --primary: #4a90d9;
    --primary-dark: #357abd;
    --primary-light: #e6f7ff;
    --success: #52c41a;
    --warning: #faad14;
    --danger: #ff4d4f;
    --male: #4a90d9;
    --female: #e91e63;
    --text: #333;
    --text-secondary: #666;
    --text-muted: #999;
    --bg: #f5f7fa;
    --bg-white: #fff;
    --border: #e8e8e8;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
    --radius: 8px;
    --radius-sm: 4px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

/* 头部 */
.header {
    background: var(--bg-white);
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary);
    white-space: nowrap;
}

.nav-tabs {
    display: flex;
    gap: 8px;
}

.nav-tab {
    padding: 8px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 15px;
    cursor: pointer;
    border-radius: var(--radius);
    transition: all 0.2s;
}

.nav-tab:hover { color: var(--primary); background: var(--primary-light); }
.nav-tab.active { color: var(--primary); background: var(--primary-light); font-weight: 500; }

.actions { display: flex; gap: 12px; }

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-white);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: white; }
.btn-secondary { background: var(--bg); border-color: var(--border); }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* 主内容 */
.main-content { padding: 24px; max-width: 1600px; margin: 0 auto; }

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.3s; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 排布页面布局 */
.arrange-container {
    display: grid;
    grid-template-columns: 280px 1fr 280px;
    gap: 24px;
    height: calc(100vh - 112px);
}

.control-panel, .student-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow-y: auto;
}

/* 面板 */
.panel {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.panel-title {
    padding: 16px;
    font-size: 15px;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-body { padding: 16px; }
.panel-header { padding: 16px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }

/* 单选选项 */
.arrange-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px;
}

.radio-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
}

.radio-label:hover { background: var(--bg); }
.radio-label input { margin-top: 2px; }
.radio-label span { font-weight: 500; }
.radio-label small {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* 表单 */
.form-group { margin-bottom: 16px; padding: 0 16px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-row {
    display: flex;
    gap: 12px;
}
.form-row .form-group { flex: 1; padding: 0; }

/* 标签选择器 */
.tag-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 0 16px 16px;
}

.tag-selector label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
}

/* 统计 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 16px;
}

.stat-item {
    text-align: center;
    padding: 12px 8px;
    background: var(--bg);
    border-radius: var(--radius-sm);
}

.stat-value {
    display: block;
    font-size: 24px;
    font-weight: 600;
    color: var(--primary);
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
}

/* 座位区域 */
.seat-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px;
    overflow: auto;
}

.podium {
    width: 180px;
    padding: 14px;
    background: linear-gradient(135deg, #8b4513 0%, #654321 100%);
    color: white;
    text-align: center;
    border-radius: var(--radius-sm);
    margin-bottom: 40px;
    font-weight: 500;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.seat-grid {
    display: grid;
    gap: 12px;
    margin-bottom: 24px;
}

.seat {
    width: 90px;
    height: 75px;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    background: var(--bg);
    border: 2px dashed var(--border);
}

.seat:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.seat.empty:hover { border-color: var(--primary); background: var(--primary-light); }

.seat.occupied {
    border-style: solid;
    border-color: transparent;
    box-shadow: var(--shadow);
}

.seat.male { background: linear-gradient(135deg, var(--male) 0%, var(--primary-dark) 100%); color: white; }
.seat.female { background: linear-gradient(135deg, var(--female) 0%, #c2185b 100%); color: white; }

.seat-number {
    position: absolute;
    top: 4px;
    left: 6px;
    font-size: 10px;
    opacity: 0.7;
}

.seat-name {
    font-size: 14px;
    font-weight: 500;
    max-width: 70px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.seat-info {
    font-size: 10px;
    opacity: 0.8;
    margin-top: 2px;
}

.seat-tag {
    position: absolute;
    top: 4px;
    right: 4px;
    font-size: 10px;
}

.seat-legend {
    display: flex;
    gap: 24px;
    margin-top: 16px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: var(--radius-sm);
}

.legend-color.male { background: var(--male); }
.legend-color.female { background: var(--female); }
.legend-color.empty { background: var(--bg); border: 2px dashed var(--border); }

/* 学生池 */
.search-box { padding: 12px 16px; border-bottom: 1px solid var(--border); }
.search-box input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.student-pool {
    padding: 12px;
    min-height: 300px;
    max-height: 500px;
    overflow-y: auto;
}

.student-card {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    cursor: move;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.student-card:hover {
    background: var(--bg-white);
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.student-card.dragging { opacity: 0.5; }

.student-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    flex-shrink: 0;
}

.student-avatar.female { background: var(--female); }

.student-info { flex: 1; min-width: 0; }
.student-name {
    font-weight: 500;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.student-meta {
    font-size: 11px;
    color: var(--text-muted);
}

.student-tags {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 6px;
    font-size: 11px;
    border-radius: 10px;
    font-weight: 500;
}

.badge {
    background: var(--primary);
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
}

/* 学生管理页面 */
.students-container { max-width: 1200px; margin: 0 auto; }

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.table-wrapper {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: var(--bg);
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
}

.data-table tr:hover { background: var(--bg); }

.data-table .actions { display: flex; gap: 8px; }

.icon-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.icon-btn:hover { background: var(--bg); }

/* 方案页面 */
.plans-container { max-width: 1200px; margin: 0 auto; }

.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.plan-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.plan-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.plan-card.active { border-color: var(--primary); }

.plan-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.plan-meta {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.plan-stats {
    display: flex;
    gap: 16px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    font-size: 13px;
}

.plan-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show { display: flex; animation: modalFade 0.2s; }

@keyframes modalFade {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-white);
    border-radius: var(--radius);
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: modalSlide 0.3s ease;
}

@keyframes modalSlide {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 { font-size: 16px; font-weight: 600; }

.close-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover { background: var(--bg); color: var(--text); }

.modal-body {
    padding: 20px;
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-area:hover { border-color: var(--primary); background: var(--primary-light); }

.upload-icon { font-size: 48px; margin-bottom: 12px; }
.upload-area p { color: var(--text-secondary); }
.upload-area .link { color: var(--primary); text-decoration: underline; }
.upload-hint { font-size: 12px; color: var(--text-muted); margin-top: 8px; }

.template-download { text-align: center; margin-top: 16px; }
.template-download a { color: var(--primary); font-size: 14px; }

/* Toast */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 8px;
    animation: toastSlide 0.3s ease;
    min-width: 200px;
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }

@keyframes toastSlide {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

/* 拖拽样式 */
.sortable-ghost { opacity: 0.4; }
.sortable-drag { opacity: 0.8; cursor: grabbing; }

/* 响应式 */
@media (max-width: 1200px) {
    .arrange-container {
        grid-template-columns: 1fr;
        height: auto;
    }
    .control-panel, .student-panel {
        flex-direction: row;
        flex-wrap: wrap;
    }
    .control-panel .panel, .student-panel .panel { flex: 1; min-width: 280px; }
}

@media (max-width: 768px) {
    .header { flex-wrap: wrap; height: auto; padding: 12px; }
    .nav-tabs { order: 3; width: 100%; margin-top: 12px; }
    .main-content { padding: 16px; }
    .seat { width: 70px; height: 60px; }
    .seat-name { font-size: 12px; }
}

/* 打印样式 */
@media print {
    .header, .control-panel, .student-panel, .btn { display: none !important; }
    .seat-area { box-shadow: none; }
    .seat { border: 1px solid #333; }
}